net: fec: remove struct fec_enet_priv_txrx_info

net: fec: remove struct fec_enet_priv_txrx_info

The struct fec_enet_priv_txrx_info has three members: offset, page and
skb. The offset is only initialized in the driver and is not used, the
skb is never initialized and used in the driver. The both will not be
used in the future. Therefore, replace struct fec_enet_priv_txrx_info
directly with struct page.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20251119025148.2817602-4-wei.fang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>